Which model of the universe gives the youngest age for its present size?
A) a recollapsing universe
B) a coasting universe
C) a critical universe
D) an accelerating universe
E) all models give the same age
A
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Describe the conditions of matter and radiation when in a state of thermal equilibrium
What will be an ideal response?
A heat pump uses 100 J of work to output 150 J of heat at some temperature. What is the coefficient of performance for the heat pump?
A. 1.0 B. 1.5 C. 2.0 D. 2.5 E. 3.0
Projectile Motion: A hunter points a rifle horizontally and holds it 3.30 m above the ground. The bullet leaves the barrel at 325 m/s and experiences no significant air resistance. The acceleration due to gravity at this location is 9.80 m/s2.(a) How long does it take for the bullet to strike the ground?(b) How far horizontally does it travel?
What will be an ideal response?
The prediction from special relativity that the length of a moving object will be shortened in the direction of motion is called __________
Fill in the blank(s) with correct word